Blasting fuse anchor



26, 1941- T. E. BARTON BLASTING FUSE ANCHOR Filed July 25, 1958I'NVENTOR.

ATTORNEY.

Patented Au ze, 1941 'QUN ED if STATE PATENT orramis -z BLASTING FUSEANCHOR Thomas E. Barton, Littleton, Colo. Application July 25, 1938,Serial No. 221,137

1' Claim. (Cl- 1022-43) This invention relates to a blasting fuseanchor,

that is, a device for anchoring a detonator or the firing extremity of ablasting fuse in an 1- explosive charge.

At presen dynamite is primed by unwrapping one extrem ty of thecartridge, inserting the capped fuse, and then tieing the wrapper aboutThe principal object of this invention is to fangs l3 to the fuse in theusual manner, as shown at l2. When forced into dynamite cartridges suchas indicated at II in Fig. 5, the fangs l3 expand therein to resistwithdrawal of the fuse.

.Dynamite cartridges are wrapped in a rela-' tively stiff,-water-proofpaper covering l5 which is folded inwardly at the extremities of thestick. The cap can be easily forced through the inwardly foldedextremity of the wrapper and the latter will cooperate with the fangs 13to prevent withdrawal of the cap and fuse.

provide automatic means for holding the fuse,

cap. or wires in place which eliminate unwrap? I ping the cartridge,tieing the fuse, or lacing the wires and yet; which will provide apositive and secure anchor for the fuse or detonator.

Other objects and advantages reside in the detail construction of theinvention, which is designed for simplicity, economy, and efllciency.

.These'will become more apparent from the following description.

In the following detailed description of the invention reference is hadto the accompanying drawing which forms a part thereof. Like nu- Jmerals refer to like parts in all views of the drawing and throughoutthe description.

In the drawing: I

Fig. 1- illustrates the invention combined as an integral part of theusual fuse cap.

I Fig. 2 illustrates the invention as an independent member used incombination with a fuse cap.

Fig. 3 illustrates the invention as applied to a fuse without the cap.

Fig. 4 ,is an end view of the anchor member taken on the line 4-4, Fig.3.

Fig. 5 illustrates the combined cap and anchor in place in a dynamitestick.

Fig. 6 illustrates the anchor in place in a pellet powder cartridge.

In the drawing a typical blasting fuse is designated by the numeral ,l 0and a typical blasting cap by the numeral It. The invention may beconstructed, as illustrated, either as an independent device or as apart of the usual detonating blasting cap.

In Fig. 2, the improved anchor is illustrated as an independent memberused in combination with the usual blasting cap it. This form of thedevice consists of a tubular sleeve H which may be crimped to the fuse,as shown at [8, by one of the usual cap crl npers or otherwise securedthereon. The sleeve I! is formedwith a series of locking fangs ortongues l9 similar to the previously described form. The independentform is inserted in the cartridge similarly to the combination formpreviously described. The independent form can also be used, however,with powder charges which do not require a detonating cap. In such ause, the sleeve I1 is crimped to the fuse, as shown in Fig. 3, and theextremity of .the fuse is forced into the powder cartridge where thefangs i9 expand to resist withdrawal thereof. It can also be used withloose powder poured in the drill hole since the fangs will preventwithdrawal of the fuse through the powder, tamping and wadding in thehole. It has also been found valuable for use with the cored powder orpellet powder cartridges, such as illustrated at 20 inFig. 6. 'Thelatter cartridge consists of a string of pressed powder cakes havin acentral passage or core and wrapped in a wrapper 2|. To prime thecartridge the fuse is pushed through the end wrapping into the core ofthe cakes 20 where the fangs l6 expand to I engage the walls thereof andhinder withdrawal.

While the invention has been described as particularly applicable toblasting fuses,. it is .desired to be understood that in cases whereelectric blasting .capsor squibs areu'sed, the improved anchor can beapplied to the ignition wires adjacent the cap similarly to itsapplicato snugly engage the fuse the latter can be forced through thesleeve and the latter will remain in position without the necessity forcrimping. If-

made of metal a non-ferrous. non-spark-producabout the fuse Ill. The capis crimped I ing metal should be used. Hard copper has been found verysatisfactory.

While a specific form of the improvement has been described andillustrated herein, it is desired to be understood that the same may bevaried, within the scope of the appended claim, without departing fromthe spirit of the invention.

Having thus described the invention, what is claimed and desired securedby Letters Patent is:

An integral self-anchoring blasting cap for fuses consisting of: atubular metallic member closed at one extremity and open at the other;

detonating material in the closed'end of said member; said member havinga circumferential constriction spaced a substantial portion of thelength of the member from the open end to bear upon a fuse; said memberhaving a plurality of spaced apart slits extending from the open end toa location adjacent the said constriction providing a plurality of fangsflared outwardly whereby to maintain the cap and associated fuse 10within a blasting charge.

THOMAS E. BARTON.

